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*Lancaster <br /> Laboratories ,Analysis Report <br /> 02425New Holland Pike,PO Box 12425 Lancaster,PA 17605-2425-717-6562300 Fax 717-656-2681•www lancasterlabs com <br /> Page 2 of 3 <br /> Quality Control Summary <br /> Client Name ChevronTexaco Group Number 889747 <br /> Reported 04/03/04 at 07 25 PM <br /> Sample Matrix Quality Control <br /> MS MSD MS/MSD RPD BKG DVP DVP Dup <br /> RPD <br /> Analysis Name %REC %REC Limita RPD MAX Conc Conc RPD Max <br /> Methyl Tertiary Butyl Ether 94 93 69-134 17- 30 <br /> di-Isopropyl ether 90 91 75-130 0 30 <br /> Ethyl t-butyl ether 92 92 78-119 1 30 <br /> t-Amyl methyl ether 96 96 77-117 0 30 <br /> t-Butyl alcohol 93 97 51-147 4 30 <br /> Benzene 99 97 83-128 2 30 <br /> 1,2-Dichloroethane 93 93 73-136 0 30 <br /> Toluene 100 101 83-127 1 30 <br /> 1,2-Dibromoethane 97 97 78-120 0 30 <br /> Ethylbenzene 100 100 82-129 1 30 <br /> Xylene (Total) 101 101 82-130 0 30 <br /> Batch number P040902AA Sample number(s) 4242260 <br /> Methyl Tertiary Butyl Ether 102 107 69-134 4 30 <br /> Benzene 108 110 83-128 1 30 <br /> Toluene 108 110 83-127 2 30 <br /> Ethylbenzene 108 110 82-129 1 30 <br /> Xylene (Total) 109 112 82-130 2 30 <br /> atch number P040911AA Sample number(s) 4242261 <br /> -Butyl alcohol 94 94 51-147 1 30 <br /> Surrogate Quality Control <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 04089A08C <br /> Trifluorotoluene-F <br /> 4242260 128 <br /> 4242261 114 <br /> 4242262 122 <br /> 4242263 114 <br /> 4242264 98 <br /> 4242265 120 <br /> Blank 92 <br /> LCS 120 <br /> LCSD 126 <br /> MS 109 <br /> Limits 57-146 <br /> Analysis Name TPH-GRO - Waters <br /> Batch number 0409OA07B <br /> Trlfluorotoluene-F <br /> 4242266 91 <br /> 4242267 80 <br /> 4242266 78 <br /> 4242269 78 <br /> Blank so <br /> LCS 94 <br /> *-Outside of specification <br /> The result for one or both determinations was less than five times the LOQ <br /> The background result was more than four times the spike added <br />